Arcane Bastion

Arcane Bastion is a fantasy tower defense game. Your castle stands at the center of the battlefield, attacks enemies automatically, and grows stronger with every upgrade. Eight defense positions surround it. Build ballistae, evolve them into archer, fire, frost, arcane, and other unique tower forms, then improve damage, attack speed, critical chance, and range separately. Waves become larger and more dangerous, with a boss arriving every fifth wave. Optional rewarded ads provide gold, boosts, protection, revival, and four temporary spells. Progress is saved automatically, and a defeat lets you retry the current wave.